IF you are happy with an IC based design, PMA, good for you! You have done what I have not yet done. Of course, I can make an IC based design. The JC-3 is an IC based design.
Perhaps the far future is in IC's almost exclusively. However, the NEAR FUTURE, and most of the rest of MY life is going to be with jfets. Almost all the companies that I consult for, and my direct competitors in the audio field, (you know, the guys who usually share the A ratings with me), have reasonable to vast stockpiles of jfets yet to use up.
It would be just like having a large vacuum tube stockpile and being an expert in tube design, being told that you are 'obsolete' and you that should switch to discrete transistors, let's say, 40 years ago. There is 'Marketing Hype' for you. You know: Solid state is better than tubes, IC's are better than discretes, and finally 'Perfect sound forever' with digital. '-)
More than 45 years ago, Dyna shifted from the Stereo 70 (tube) to the Stereo 120 (solid state), the PAS 3 (tube) to the PAT 4 (solid state), later, McIntosh stopped making the C22 (tube) and the 350 (tube), some of the best equipment in the world at that time, and replaced it with solid state 'schlock'. Those designs were EMBARRASSING, because the designers were forced to move prematurely to solid state, when: Really good parts were not available, the resident designers had little experience with solid state, and pre-made designs that were useful for the military-industrial complex, were NOT really that successful processing audio. It took us years of quiet development, behind the scenes, to make the complementary differential input stage, (45 years ago), complementary differential jfet input stage (40 years ago), mosfets weren't even designed yet, and this took another decade, and finally the Japanese took to making exquisite to exotic complementary components for audio, just as a point of pride, to show off their design and fabrication skills, starting about 35 years ago.
We have had a good run, especially with the Japanese parts, but of course, they are being discontinued. Good luck everybody with what is available to you in the future! '-)

IF you are happy with an IC based design, PMA, good for you! You have done what I have not yet done. Of course, I can make an IC based design. The JC-3 is an IC based design.
Perhaps the far future is in IC's almost exclusively. However, the NEAR FUTURE, and most of the rest of MY life is going to be with jfets. Almost all the companies that I consult for, and my direct competitors in the audio field, (you know, the guys who usually share the A ratings with me), have reasonable to vast stockpiles of jfets yet to use up.
It would be just like having a large vacuum tube stockpile and being an expert in tube design, being told that you are 'obsolete' and you that should switch to discrete transistors, let's say, 40 years ago. There is 'Marketing Hype' for you. You know: Solid state is better than tubes, IC's are better than discretes, and finally 'Perfect sound forever' with digital. '-)
More than 45 years ago, Dyna shifted from the Stereo 70 (tube) to the Stereo 120 (solid state), the PAS 3 (tube) to the PAT 4 (solid state), later, McIntosh stopped making the C22 (tube) and the 350 (tube), some of the best equipment in the world at that time, and replaced it with solid state 'schlock'. Those designs were EMBARRASSING, because the designers were forced to move prematurely to solid state, when: Really good parts were not available, the resident designers had little experience with solid state, and pre-made designs that were useful for the military-industrial complex, were NOT really that successful processing audio. It took us years of quiet development, behind the scenes, to make the complementary differential input stage, (45 years ago), complementary differential jfet input stage (40 years ago), mosfets weren't even designed yet, and this took another decade, and finally the Japanese took to making exquisite to exotic complementary components for audio, just as a point of pride, to show off their design and fabrication skills, starting about 35 years ago.
We have had a good run, especially with the Japanese parts, but of course, they are being discontinued. Good luck everybody with what is available to you in the future! '-)

Yep, especially with RoHS directive (unleaded) and whiskers growing up as the size of SMDs is ...downsizig, metal can transistors (dissipation) , RN65 resistors , disapear ... i stock for my future

He also does a mathematical treatment of the general case, so you can plug in whatever frequency you like. I am involuntarily separated from my library at the moment, but if you have a copy of Valve Amplifiers, it's cited in there, and there's scans floating around the intertubes.

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"Pity, wrath, heroism, filled them, but the power of putting two and two together was annihilated."- EM Forster

He also does a mathematical treatment of the general case, so you can plug in whatever frequency you like. I am involuntarily separated from my library at the moment, but if you have a copy of Valve Amplifiers, it's cited in there, and there's scans floating around the intertubes.

Math! Nobody does math any more. It would screw up opinions, require you to think and know what a pencil and paper are used for.

The thing that popped out was that the transformer uses up 60 degrees of the cycle actually charging, pretty much no matter what the load.